private void MoveBranchNode(Page parentPage, Page from, Page to)
{
Debug.Assert(from.IsBranch);
var originalFromKeyStart = GetActualKey(from, from.LastSearchPositionOrLastEntry);
to.EnsureHasSpaceFor(_tx, originalFromKeyStart, -1);
var fromNode = from.GetNode(from.LastSearchPosition);
long pageNum = fromNode->PageNumber;
if (to.LastSearchPosition == 0)
{
// cannot add to left implicit side, adjust by moving the left node
// to the right by one, then adding the new one as the left
var implicitLeftKey = GetActualKey(to, 0);
var leftPageNumber = to.GetNode(0)->PageNumber;
to.AddPageRefNode(1, implicitLeftKey, leftPageNumber);
to.ChangeImplicitRefPageNode(pageNum); // setup the new implicit node
}
else
{
to.AddPageRefNode(to.LastSearchPosition, originalFromKeyStart, pageNum);
}
if (from.LastSearchPositionOrLastEntry == 0)
{
var rightPageNumber = from.GetNode(1)->PageNumber;
from.RemoveNode(0); // remove the original implicit node
from.ChangeImplicitRefPageNode(rightPageNumber); // setup the new implicit node
Debug.Assert(from.NumberOfEntries >= 2);
}
else
{
from.RemoveNode(from.LastSearchPositionOrLastEntry);
}
var pos = parentPage.LastSearchPositionOrLastEntry;
parentPage.RemoveNode(pos);
var newKey = GetActualKey(to, 0); // get the next smallest key it has now
var pageNumber = to.PageNumber;
if (parentPage.GetNode(0)->PageNumber == to.PageNumber)
{
pageNumber = from.PageNumber;
newKey = GetActualKey(from, 0);
}
parentPage.EnsureHasSpaceFor(_tx, newKey, -1);
parentPage.AddPageRefNode(pos, newKey, pageNumber);
}
private void MoveBranchNode(Page parentPage, Page from, Page to)
{
Debug.Assert(from.IsBranch);
var originalFromKey = to.PrepareKeyToInsert(GetActualKey(from, from.LastSearchPositionOrLastEntry), to.LastSearchPosition);
to.EnsureHasSpaceFor(_tx, originalFromKey, -1);
var fromNode = from.GetNode(from.LastSearchPosition);
long pageNum = fromNode->PageNumber;
if (to.LastSearchPosition == 0)
{
// cannot add to left implicit side, adjust by moving the left node
// to the right by one, then adding the new one as the left
NodeHeader *actualKeyNode;
var implicitLeftKey = GetActualKey(to, 0, out actualKeyNode);
var implicitLeftNode = to.GetNode(0);
var leftPageNumber = implicitLeftNode->PageNumber;
MemorySlice implicitLeftKeyToInsert;
if (implicitLeftNode == actualKeyNode)
{
// no need to create a prefix, just use the existing prefixed key from the node
// this also prevents from creating a prefix which is the full key given in 'implicitLeftKey'
if (_tree.KeysPrefixing)
{
implicitLeftKeyToInsert = new PrefixedSlice(actualKeyNode);
}
else
{
implicitLeftKeyToInsert = new Slice(actualKeyNode);
}
}
else
{
implicitLeftKeyToInsert = to.PrepareKeyToInsert(implicitLeftKey, 1);
}
to.EnsureHasSpaceFor(_tx, implicitLeftKeyToInsert, -1);
to.AddPageRefNode(1, implicitLeftKeyToInsert, leftPageNumber);
to.ChangeImplicitRefPageNode(pageNum); // setup the new implicit node
}
else
{
to.AddPageRefNode(to.LastSearchPosition, originalFromKey, pageNum);
}
if (from.LastSearchPositionOrLastEntry == 0)
{
var rightPageNumber = from.GetNode(1)->PageNumber;
from.RemoveNode(0); // remove the original implicit node
from.ChangeImplicitRefPageNode(rightPageNumber); // setup the new implicit node
Debug.Assert(from.NumberOfEntries >= 2);
}
else
{
from.RemoveNode(from.LastSearchPositionOrLastEntry);
}
var pos = parentPage.LastSearchPositionOrLastEntry;
parentPage.RemoveNode(pos);
var newSeparatorKey = GetActualKey(to, 0); // get the next smallest key it has now
var pageNumber = to.PageNumber;
if (parentPage.GetNode(0)->PageNumber == to.PageNumber)
{
pageNumber = from.PageNumber;
newSeparatorKey = GetActualKey(from, 0);
}
AddSeparatorToParentPage(parentPage, pageNumber, newSeparatorKey, pos);
}
private void MoveBranchNode(Page parentPage, Page from, Page to)
{
Debug.Assert(from.IsBranch);
var originalFromKey = to.PrepareKeyToInsert(GetActualKey(from, from.LastSearchPositionOrLastEntry), to.LastSearchPosition);
to.EnsureHasSpaceFor(_tx, originalFromKey, -1);
var fromNode = from.GetNode(from.LastSearchPosition);
long pageNum = fromNode->PageNumber;
if (to.LastSearchPosition == 0)
{
// cannot add to left implicit side, adjust by moving the left node
// to the right by one, then adding the new one as the left
NodeHeader* actualKeyNode;
var implicitLeftKey = GetActualKey(to, 0, out actualKeyNode);
var implicitLeftNode = to.GetNode(0);
var leftPageNumber = implicitLeftNode->PageNumber;
MemorySlice implicitLeftKeyToInsert;
if (implicitLeftNode == actualKeyNode)
{
// no need to create a prefix, just use the existing prefixed key from the node
// this also prevents from creating a prefix which is the full key given in 'implicitLeftKey'
if (_tree.KeysPrefixing)
implicitLeftKeyToInsert = new PrefixedSlice(actualKeyNode);
else
implicitLeftKeyToInsert = new Slice(actualKeyNode);
}
else
implicitLeftKeyToInsert = to.PrepareKeyToInsert(implicitLeftKey, 1);
to.EnsureHasSpaceFor(_tx, implicitLeftKeyToInsert, -1);
to.AddPageRefNode(1, implicitLeftKeyToInsert, leftPageNumber);
to.ChangeImplicitRefPageNode(pageNum); // setup the new implicit node
}
else
{
to.AddPageRefNode(to.LastSearchPosition, originalFromKey, pageNum);
}
if (from.LastSearchPositionOrLastEntry == 0)
{
var rightPageNumber = from.GetNode(1)->PageNumber;
from.RemoveNode(0); // remove the original implicit node
from.ChangeImplicitRefPageNode(rightPageNumber); // setup the new implicit node
Debug.Assert(from.NumberOfEntries >= 2);
}
else
{
from.RemoveNode(from.LastSearchPositionOrLastEntry);
}
var pos = parentPage.LastSearchPositionOrLastEntry;
parentPage.RemoveNode(pos);
var newSeparatorKey = GetActualKey(to, 0); // get the next smallest key it has now
var pageNumber = to.PageNumber;
if (parentPage.GetNode(0)->PageNumber == to.PageNumber)
{
pageNumber = from.PageNumber;
newSeparatorKey = GetActualKey(from, 0);
}
AddSeparatorToParentPage(parentPage, pageNumber, newSeparatorKey, pos);
}
private void MoveBranchNode(Page parentPage, Page from, Page to)
{
Debug.Assert(from.IsBranch);
var originalFromKeyStart = GetActualKey(from, from.LastSearchPositionOrLastEntry);
to.EnsureHasSpaceFor(_tx, originalFromKeyStart, -1);
var fromNode = from.GetNode(from.LastSearchPosition);
long pageNum = fromNode->PageNumber;
if (to.LastSearchPosition == 0)
{
// cannot add to left implicit side, adjust by moving the left node
// to the right by one, then adding the new one as the left
var implicitLeftKey = GetActualKey(to, 0);
var leftPageNumber = to.GetNode(0)->PageNumber;
to.AddPageRefNode(1, implicitLeftKey, leftPageNumber);
to.ChangeImplicitRefPageNode(pageNum); // setup the new implicit node
}
else
{
to.AddPageRefNode(to.LastSearchPosition, originalFromKeyStart, pageNum);
}
if (from.LastSearchPositionOrLastEntry == 0)
{
var rightPageNumber = from.GetNode(1)->PageNumber;
from.RemoveNode(0); // remove the original implicit node
from.ChangeImplicitRefPageNode(rightPageNumber); // setup the new implicit node
Debug.Assert(from.NumberOfEntries >= 2);
}
else
{
from.RemoveNode(from.LastSearchPositionOrLastEntry);
}
var pos = parentPage.LastSearchPositionOrLastEntry;
parentPage.RemoveNode(pos);
var newKey = GetActualKey(to, 0); // get the next smallest key it has now
var pageNumber = to.PageNumber;
if (parentPage.GetNode(0)->PageNumber == to.PageNumber)
{
pageNumber = from.PageNumber;
newKey = GetActualKey(from, 0);
}
parentPage.EnsureHasSpaceFor(_tx, newKey, -1);
parentPage.AddPageRefNode(pos, newKey, pageNumber);
}
